#!/bin/bash
function s1_generate_a_series_of_files() {
    for i in $(seq 1 100);do 
      echo -n "$i" > "/tmp/new_file$i"
     done
}
function s2_list_4_files_in_long_format_about_account_and_group() {
ls -l /etc/group /etc/gshadow /etc/passwd /etc/shadow |sort 
}
function s3_find_items_related_to_given_username() {
grep "^$1:" /etc/{passwd,shadow} |sort
}
function s4_find_items_related_to_given_group_name(){
grep "^$1:" /etc/{group,gshadow} |sort
}
function s5_create_groups_for_given_group_names() {
   groupadd rnd 
   groupadd itoperation
}
function s6_create_users_and_set_their_group_as_required(){
useradd -m -G rnd adam 
 useradd -m -G rnd bob 
 useradd -m -G itoperation calvin 
 useradd -m -G itoperation david 
 useradd -m -G rnd edward
}
function s7_change_users_shell() {
chsh -s /usr/bin/sh adam
 chsh -s /usr/bin/sh edward
}
function s8_set_password_change_policy(){
for user in adam bob calvin david  edward; do
 chage -m 10 -M 60 -W 10 $user
done
}
function s9_set_password_for_five_users(){
usernames=(adam bob calvin david edward)
for i in $(seq 0 4);do
 echo "${usernames[$i]}:$(!((i + 1)))" | chpasswd
done
}
function s10_lock_bobs_password(){
usermod -L bob
}
function s11_include_adam_into_wheel_group(){
usermod -a -G wheel adam
}
function s12_change_files_permission() {
for i in $(seq 3 3 100);do
 chmod  640 "/tmp/new_file$i"
done
}

